extension buttons in title bar unusable after latest update

Today my machine crashed and upon reboot, I got a popup to upgrade Vivaldi. Not sure how long the update had been around - I just know I downloaded it today and it is presumably <1 week old since that's how long ago I switched to Vivaldi :)

There used to be an icon for extensions in the title bar - in my case I only use one, 1password. There was a little lock icon (1password's logo) I could click to autopopulate logins.

Now there is instead a "..." (in vertical mode) icon. Clicking it does make a "button pressed" animation - but nothing else happens - I can neither select an extension to use nor does it "activate" the existing extension. Screenshot shows where the icon disappeared from and what it was replaced with:

@fool You can disable the extension-toggle in vivaldi://settings/addressbar/, then all your extensions that have an enabled extension button should show.

This is still strange, since it should work with the toggle too. You should take a look at your extension page vivaldi://extensions/?path=& and check if there is a "show button" - button beyond the extension which don't show up -- just to make sure.